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Re: Experience with HP Smart Array P400 and SATA drives?

From: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>
To: "Mario Weilguni" <mweilguni(at)sime(dot)com>
Cc: "Aidan Van Dyk" <aidan(at)highrise(dot)ca>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Date: 2008-12-10 16:17:28
Message-ID: dcc563d10812100817v119397b8n6b8799fcecb22847@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, Dec 10, 2008 at 9:05 AM, Mario Weilguni <mweilguni(at)sime(dot)com> wrote:
> In fact, for this system we're currently going to RAID10, I'm convinced now.
> With other systems we have, RAID5 is a safe option for one reason, the
> machines are clusters, so we have (sort of) RAID50 here:
> Machine A/RAID5 <-- DRBD --> Machine B/RAID5
>
> Seems reliable enough for me. But in this case, the machine will be
> standalone, and so RAID5 might really not be the best choice.
>
> However, I'm pretty sure we'll have the same problems with RAID10, the
> problem seems  to have to do with P400 and/or SATA drives.

Yeah, I'm thinking there's something off in your system and until you
resolve it you're going to have issues.  I'd check the following:

firmware on RAID controller
how it runs with a couple of SAS drives in RAID-1 or RAID-0 (just for testing)
OS version / kernel version / driver version.  especially compared to
your customer's machine.  See how much of his environment you can
clone until performance goes up where it should be.  Then change one
thing at a time until you break it again. I'm sure everyone here would
like to know what makes a P400 fast or slow.

Or, if you don't have time to mess with it, just order an escalade or
areca card and be done with it. :)

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Next:From: Matthew WakelingDate: 2008-12-10 18:08:01
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Previous:From: Mario WeilguniDate: 2008-12-10 16:05:06
Subject: Re: Experience with HP Smart Array P400 and SATA drives?

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